/*
 * Copyright 2017 Patrick Ahlbrecht
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.onyxbits.raccoon.db;

import java.lang.reflect.InvocationTargetException;

import javax.swing.SwingUtilities;

/**
 * {@link DatasetEvent}S can occur on any {@link Thread}. Subscribing to a DAO
 * via this proxy ensures that teh event is delivered in the EDT.
 * 
 * @author patrick
 * 
 */
public class DatasetListenerProxy implements DatasetListener, Runnable {

	private DatasetListener client;
	private DatasetEvent event;

	/**
	 * Constructs a new forwarding proxy.
	 * 
	 * @param client
	 *          The listener to forward the event to.
	 */
	public DatasetListenerProxy(DatasetListener client) {
		this.client = client;
	}

	@Override
	public void onDataSetChange(DatasetEvent event) {
		if (SwingUtilities.isEventDispatchThread()) {
			client.onDataSetChange(event);
		}
		else {
			synchronized (this) {
				this.event = event;
				try {
					SwingUtilities.invokeAndWait(this);
				}
				catch (InvocationTargetException e) {
				}
				catch (InterruptedException e) {
				}
			}
		}
	}

	@Override
	public void run() {
		client.onDataSetChange(event);
	}

}
